Fizzy, I've not seen the Red 600, but I just picked up my red 650 today. It's like a reddish orange color, maybe closer to a deep magenta. I wish I had a color swatch to take pictures and compare to. But, my red sticky notes look almost bright fire orange red compared to the 650.

This picture on Engadget shows the 600 and 650 in the same shot, although not close enough together to get a true sense. It seems like the 600 is more maroon (purple/brown) and the 650 is more a blue-toned red.

This picture on Engadget shows the 600 and 650 in the same shot, although not close enough together to get a true sense. It seems like the 600 is more maroon (purple/brown) and the 650 is more a blue-toned red.

The photos on that site doesn't do the red PRS 650 any justice, there it looks like it is firetruck red, but in reality it's much darker and deeper kind of red, almost with a touch of dark pink in it. Can't explain, but in reality it looks way more beautiful then on the pictures on that site.